// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef GPU_COMMAND_BUFFER_SERVICE_IMAGE_FACTORY_H_
#define GPU_COMMAND_BUFFER_SERVICE_IMAGE_FACTORY_H_

#include "base/memory/ref_counted.h"
#include "gpu/gpu_export.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/gpu_memory_buffer.h"

namespace gfx {
class GLImage;
}

namespace gpu {
struct Capabilities;

class GPU_EXPORT ImageFactory {
public:
    ImageFactory();

    // Returns a valid GpuMemoryBuffer format given a valid internalformat as
    // defined by CHROMIUM_gpu_memory_buffer_image.
    static gfx::BufferFormat DefaultBufferFormatForImageFormat(
        unsigned internalformat);

    // Returns a valid GpuMemoryBuffer usage given a valid usage as defined by
    // CHROMIUM_gpu_memory_buffer_image.
    static gfx::BufferUsage ImageUsageToGpuMemoryBufferUsage(unsigned usage);

    // Returns true if |internalformat| is compatible with |format|.
    static bool IsImageFormatCompatibleWithGpuMemoryBufferFormat(
        unsigned internalformat,
        gfx::BufferFormat format);

    // Returns true if |format| is supported by |capabilities|.
    static bool IsGpuMemoryBufferFormatSupported(
        gfx::BufferFormat format,
        const Capabilities& capabilities);

    // Returns true if |size| is valid for |format|.
    static bool IsImageSizeValidForGpuMemoryBufferFormat(
        const gfx::Size& size,
        gfx::BufferFormat format);

    // Creates a GLImage instance for GPU memory buffer identified by |handle|.
    // |client_id| should be set to the client requesting the creation of instance
    // and can be used by factory implementation to verify access rights.
    virtual scoped_refptr<gfx::GLImage> CreateImageForGpuMemoryBuffer(
        const gfx::GpuMemoryBufferHandle& handle,
        const gfx::Size& size,
        gfx::BufferFormat format,
        unsigned internalformat,
        int client_id)
        = 0;

protected:
    virtual ~ImageFactory();
};

} // namespace gpu

#endif // GPU_COMMAND_BUFFER_SERVICE_IMAGE_FACTORY_H_
